Tris (substituted hydroxyphenylthio) trithioorthoester stabilizers for polymers

Abstract

The title compounds correspond to the formula ##STR1## and are useful as stabilizers for organic polymers and lubricating oils to counteract the degradative effects of heat, light and air.

What is claimed is: 
     
       1. A compound of the formula ##STR3## wherein R 1  and R 2  are independently hydrogen, alkyl of 1 to 18 carbon atoms, cycloalkyl of 5 to 12 carbon atoms, phenyl, phenyl substituted by alkyl of 1 to 18 carbon atoms, aralkyl of 7 to 9 carbon atoms or said aralkyl substituted by alkyl of 1 to 18 carbon atoms; and A is hydrogen, alkyl of 1 to 30 carbon atoms, cycloalkyl of 5 to 12 carbon atoms, aryl, aryl substituted by alkyl of 1 to 18 carbon atoms, aralkyl of 7 to 9 carbon atoms or said aralkyl substituted by alkyl of 1 to 12 carbon atoms.   
     
     
       2. The compound of claim 1, wherein R 1  and R 2  are in the ortho position to the hydroxyl group. 
     
     
       3. The compound of claim 2, wherein R 1  and R 2  are alkyl of from 1 to 8 carbon atoms. 
     
     
       4. The compound of claim 3, wherein R 1  is tert.butyl and R 2  is methyl or tert.butyl. 
     
     
       5. The compound of claim 4, wherein R 1  and R 2  are tert.butyl. 
     
     
       6. The compound of claim 1, wherein A is hydrogen, alkyl of 1 to 18 carbon atoms or phenyl. 
     
     
       7. 1,1,1-Tris (3,5-di-tert-butyl-4-hydroxyphenylthio)methane according to claim 4. 
     
     
       8. 1,1,1-Tris(3-tert-butyl-5-methyl-4-hydroxyphenylthio)methane according to claim 4. 
     
     
       9. 1,1,1-Tris(2-methyl-5-tert-butyl-4-hydroxyphenylthio)methane according to claim 1. 
     
     
       10. 1,1,1-Tris(3,5-dimethyl-4-hydroxyphenylthio)methane according to claim 1. 
     
     
       11. A composition of matter comprising an organic material subject to oxidative, thermal or actinic degradation stabilized with an effective stabilizing amount of a compound of claim 1. 
     
     
       12. The composition of claim 11, wherein the organic material is a synthetic polymer. 
     
     
       13. The composition of claim 12, wherein said polymer is selected from the group consisting of impact polystyrene, acrylonitrile/butadiene/sytrene, styrene/butadiene rubber, polyesters and poly-alpha-olefins. 
     
     
       14. A method for stabilizing an organic material against oxidative, thermal or actinic degradation which comprises incorporating into said organic material an effective stabilizing amount of a compound of claim 1.